This problem may result from several different X server bugs. You
may be able to avoid it by switching from overlay graphics mode (the
usual default) to shared color mode (selected using WAVE 's -S
command-line option), or vice versa, since WAVE uses different
techniques for drawing in the scope window depending on the display
mode.

A bug in network file handling can sometimes interfere with correct display of
waveforms in the scope window when reading records via HTTP. For now, the only
workarounds are to restart WAVE , or to copy the record to local disk files
(this can be done easily using
xform,
snip, or a web browser). Check
PhysioNet
for updates to WAVE
or to the WFDB library that may correct this bug.